Resource request management

ABSTRACT

A resource management system may use information regarding the bandwidth status of a downstream communication path to determine what portion of queued content should be sent in the current available bandwidth timeslot. In some embodiments, multiple versions of the same requested content may be available, and the system may select a lower-quality version to send if needed to meet a time deadline included in the original content request.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of and claims priority to U.S.patent application Ser. No. 14/808,622, filed Jul. 24, 2015, which is acontinuation of U.S. patent application Ser. No. 13/790,262, filed Mar.8, 2013, and issued as U.S. Pat. No. 9,131,009, the disclosures of eachof which are incorporated by reference herein in their entirety.

BACKGROUND

With the increase in network data traffic, the value of communicationbandwidth is ever increasing. There is a persistent for managingnetworks need for managing networks to efficiently use and preservebandwidth.

SUMMARY

The following summary is for illustrative purposes only, and is notintended to limit or constrain the detailed description.

In some embodiments, computing devices may send requests for content,such as requests for fragments of a video that the device is presentingfor a user, to a content server. The request may identify the requestedcontent as well as a time by which the content is needed, and thecontent server may use this information, along with informationregarding current usage levels in a downstream bandwidth, to determinewhen to send the requested content to the client device.

In some embodiments, the content server may have multiple differentversions of the same requested content, with each version having adifferent data size, and the content server may elect to send adifferent-sized version of the content in response to the reporteddownstream bandwidth usage levels. Sometimes, the content server maysend a version that is of a lower quality than a requested quality, inorder to ensure that the receiving device (e.g., a client) receives therequested content prior to the time needed. The selection of a versionto send, and the selection of a content to send (when there are multipleitems of contents waiting to be sent) may also be based on how muchunused available bandwidth would remain if the content were sent. Thecontent server may try to use as much of the available bandwidth aspossible, sending the largest piece of waiting content that will fit,even if it was requested later in time than a smaller, waiting piece ofcontent.

As noted above, this summary is merely a summary of some of the featuresdescribed herein. It is not exhaustive, and it is not to be a limitationon the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the presentdisclosure will become better understood with regard to the followingdescription, claims, and drawings. The present disclosure is illustratedby way of example, and not limited by, the accompanying figures in whichlike numerals indicate similar elements.

FIG. 1 illustrates an example communication network on which variousfeatures described herein may be used.

FIG. 2 illustrates an example computing device that can be used toimplement any of the methods, servers, entities, and computing devicesdescribed herein.

FIG. 3 illustrates a portion of the communication network shown in FIG.1, with examples of network usage.

FIG. 4 illustrates an example process of managing requests.

FIGS. 5a-d illustrate example bandwidth usages.

DETAILED DESCRIPTION

In the following description of various illustrative embodiments,reference is made to the accompanying drawings, which form a parthereof, and in which is shown, by way of illustration, variousembodiments in which aspects of the disclosure may be practiced. It isto be understood that other embodiments may be utilized, and structuraland functional modifications may be made, without departing from thescope of the present disclosure.

FIG. 1 illustrates an example communication network 100 on which many ofthe various features described herein may be implemented. Network 100may be any type of information distribution network, such as satellite,telephone, cellular, wireless, etc. One example may be an optical fibernetwork, a coaxial cable network, or a hybrid fiber/coax distributionnetwork. Such networks 100 use a series of interconnected communicationlinks 101 (e.g., coaxial cables, optical fibers, wireless, etc.) toconnect multiple premises 102 (e.g., businesses, homes, consumerdwellings, etc.) to a local office or headend 103. The local office 103may transmit downstream information signals onto the links 101, and eachpremises 102 may have a receiver used to receive and process thosesignals.

There may be one link 101 originating from the local office 103, and itmay be split a number of times to distribute the signal to variouspremises 102 in the vicinity (which may be many miles) of the localoffice 103. The links 101 may include components not illustrated, suchas splitters, filters, amplifiers, etc. to help convey the signalclearly, but in general each split introduces a bit of signaldegradation. Portions of the links 101 may also be implemented withfiber-optic cable, while other portions may be implemented with coaxialcable, other lines, or wireless communication paths.

The local office 103 may include an interface, such as a terminationsystem (TS) 104. More specifically, the interface 104 may be a cablemodem termination system (CMTS), which may be a computing deviceconfigured to manage communications between devices on the network oflinks 101 and backend devices such as servers 105-107 (to be discussedfurther below). The interface 104 may be as specified in a standard,such as the Data Over Cable Service Interface Specification (DOCSIS)standard, published by Cable Television Laboratories, Inc. (a.k.a.CableLabs), or it may be a similar or modified device instead. Theinterface 104 may be configured to place data on one or more downstreamfrequencies to be received by modems at the various premises 102, and toreceive upstream communications from those modems on one or moreupstream frequencies.

The local office 103 may also include one or more network interfaces108, which can permit the local office 103 to communicate with variousother external networks 109. These networks 109 may include, forexample, networks of Internet devices, telephone networks, cellulartelephone networks, fiber optic networks, local wireless networks (e.g.,WiMAX), satellite networks, and any other desired network, and thenetwork interface 108 may include the corresponding circuitry needed tocommunicate on the external networks 109, and to other devices on thenetwork such as a cellular telephone network and its corresponding cellphones.

As noted above, the local office 103 may include a variety of servers105-107 that may be configured to perform various functions. Forexample, the local office 103 may include a push notification server105. The push notification server 105 may generate push notifications todeliver data and/or commands to the various premises 102 in the network(or more specifically, to the devices in the premises 102 that areconfigured to detect such notifications). The local office 103 may alsoinclude a content server 106. The content server 106 may be one or morecomputing devices that are configured to provide content to users attheir premises. This content may be, for example, video on demandmovies, television programs, songs, text listings, etc. The contentserver 106 may include software to validate user identities andentitlements, to locate and retrieve requested content, to encrypt thecontent, and to initiate delivery (e.g., streaming) of the content tothe requesting user(s) and/or device(s).

The local office 103 may also include one or more application servers107. An application server 107 may be a computing device configured tooffer any desired service, and may run various languages and operatingsystems (e.g., servlets and JSP pages running on Tomcat/MySQL, OSX, BSD,Ubuntu, Redhat, HTML5, JavaScript, AJAX and COMET). For example, anapplication server may be responsible for collecting television programlistings information and generating a data download for electronicprogram guide listings. Another application server may be responsiblefor monitoring user viewing habits and collecting that information foruse in selecting advertisements. Yet another application server may beresponsible for formatting and inserting advertisements in a videostream being transmitted to the premises 102. Although shown separately,one of ordinary skill in the art will appreciate that the push server105, content server 106, and application server 107 may be combined.Further, here the push server 105, content server 106, and applicationserver 107 are shown generally, and it will be understood that they mayeach contain memory storing computer executable instructions to cause aprocessor to perform steps described herein and/or memory for storingdata.

An example premises 102 a, such as a home, may include an interface 120.The interface 120 can include any communication circuitry needed toallow a device to communicate on one or more links 101 with otherdevices in the network. For example, the interface 120 may include amodem 110, which may include transmitters and receivers used tocommunicate on the links 101 and with the local office 103. The modem110 may be, for example, a coaxial cable modem (for coaxial cable lines101), a fiber interface node (for fiber optic lines 101), twisted-pairtelephone modem, cellular telephone transceiver, satellite transceiver,local wi-fi router or access point, or any other desired modem device.Also, although only one modem is shown in FIG. 1, a plurality of modemsoperating in parallel may be implemented within the interface 120.Further, the interface 120 may include a gateway interface device 111.The modem 110 may be connected to, or be a part of, the gatewayinterface device 111. The gateway interface device 111 may be acomputing device that communicates with the modem(s) 110 to allow one ormore other devices in the premises 102 a, to communicate with the localoffice 103 and other devices beyond the local office 103. The gateway111 may be a set-top box (STB), digital video recorder (DVR), computerserver, or any other desired computing device. The gateway 111 may alsoinclude (not shown) local network interfaces to provide communicationsignals to requesting entities/devices in the premises 102 a, such asdisplay devices 112 (e.g., televisions), additional STBs 112, personalcomputers 114, laptop computers 115, wireless devices 116 (e.g.,wireless routers, wireless laptops, notebooks, tablets and netbooks,cordless phones (e.g., Digital Enhanced Cordless Telephone—DECT phones),mobile phones, mobile televisions, personal digital assistants (PDA),etc.), landline phones 117 (e.g. Voice over Internet Protocol—VoIPphones), and any other desired devices. Examples of the local networkinterfaces include Multimedia Over Coax Alliance (MoCA) interfaces,Ethernet interfaces, universal serial bus (USB) interfaces, wirelessinterfaces (e.g., IEEE 802.11, IEEE 802.15), analog twisted pairinterfaces, Bluetooth interfaces, and others.

FIG. 2 illustrates general hardware elements that can be used toimplement any of the various computing devices discussed herein. Thecomputing device 200 may include one or more processors 201, which mayexecute instructions of a computer program to perform any of thefeatures described herein. The instructions may be stored in any type ofcomputer-readable medium or memory, to configure the operation of theprocessor 201. For example, instructions may be stored in a read-onlymemory (ROM) 202, random access memory (RAM) 203, removable media 204,such as a Universal Serial Bus (USB) drive, compact disk (CD) or digitalversatile disk (DVD), floppy disk drive, or any other desired storagemedium. Instructions may also be stored in an attached (or internal)hard drive 205. The computing device 200 may include one or more outputdevices, such as a display 206 (e.g., an external television), and mayinclude one or more output device controllers 207, such as a videoprocessor. There may also be one or more user input devices 208, such asa remote control, keyboard, mouse, touch screen, microphone, etc. Thecomputing device 200 may also include one or more network interfaces,such as a network input/output (I/O) circuit 209 (e.g., a network card)to communicate with an external network 210. The network input/outputcircuit 209 may be a wired interface, wireless interface, or acombination of the two. In some embodiments, the network input/outputcircuit 209 may include a modem (e.g., a cable modem), and the externalnetwork 210 may include the communication links 101 discussed above, theexternal network 109, an in-home network, a provider's wireless,coaxial, fiber, or hybrid fiber/coaxial distribution system (e.g., aDOCSIS network), or any other desired network. Additionally, the devicemay include a location-detecting device, such as a global positioningsystem (GPS) microprocessor 211, which can be configured to receive andprocess global positioning signals and determine, with possibleassistance from an external server and antenna, a geographic position ofthe device.

The FIG. 2 example is a hardware configuration. Modifications may bemade to add, remove, combine, divide, etc. components of the computingdevice 200 as desired. Additionally, the components illustrated may beimplemented using basic computing devices and components, and the samecomponents (e.g., processor 201, ROM storage 202, display 206, etc.) maybe used to implement any of the other computing devices and componentsdescribed herein. For example, the various components herein may beimplemented using computing devices having components such as aprocessor executing computer-executable instructions stored on acomputer-readable medium, as illustrated in FIG. 2. Some or all of theentities described herein may be software based, and may co-exist in acommon physical platform (e.g., a requesting entity can be a separatesoftware process and program from a dependent entity, both of which maybe executed as software on a common computing device).

One or more aspects of the disclosure may be embodied in acomputer-usable data and/or computer-executable instructions, such as inone or more program modules, executed by one or more computers or otherdevices. Generally, program modules include routines, programs, objects,components, data structures, etc. that perform particular tasks orimplement particular abstract data types when executed by a processor ina computer or other data processing device. The computer executableinstructions may be stored on one or more computer readable media suchas a hard disk, optical disk, removable storage media, solid statememory, RAM, etc. As will be appreciated by one of skill in the art, thefunctionality of the program modules may be combined or distributed asdesired in various embodiments. In addition, the functionality may beembodied in whole or in part in firmware or hardware equivalents such asintegrated circuits, field programmable gate arrays (FPGA), and thelike. Particular data structures may be used to more effectivelyimplement one or more aspects of the disclosure, and such datastructures are contemplated within the scope of computer executableinstructions and computer-usable data described herein.

FIG. 3 illustrates an example portion of the network shown in FIG. 1. Inparticular, the communication link 101 between a termination server 104and a corresponding access device, such as modem 110, may be comprisedof a variety of sub-links 301-302. These sub-links may be logical and/orphysical transmission channels or frequencies, such as DOCSIS downstreamand upstream frequencies, bonded groups of frequencies, timeslotallocations on a shared channel, or any other desired transmissionprotocol. The termination server 104, in the example of an HFC network,may manage one or more quadrature amplitude modulation (QAM)transmitters for downstream channels 301 a-c that may be used to deliverdata from the termination server to the modem 110, while upstreamchannel 302 may be used to deliver data from the modem 110 to thetermination server 104. Elements 301 a-c may be any type of acommunication path. In one example use scenario, a user may be using atablet computing device to watch a streaming movie offered by a videodelivery service. To obtain the movie, the user may use a browser on thetablet to connect to the user's modem 110, which may then forward arequest to the termination server 104, requesting access to the videodelivery service's listing of content and/or Internet portal. Thetermination server 104 may receive the request, and prepare acorresponding request to a content server 106 for the delivery service(e.g., an edge cache in a video content delivery network), via whateverintermediate network connections may be needed, and the content server106 may respond by providing the requested listing and/or Internetportal page to the termination server 104, which may in turn providethis information to the modem 110 for eventual delivery to the user'stablet.

During streaming playback of the movie, the user's tablet might onlyreceive an initial portion of the movie, and may periodically issuerequests for more of the movie as they are needed. For example, thetablet may initially store, or buffer, the first minute of the movie,and it may then request additional fragments of the movie as they areneeded. The fragments themselves may vary in size and/or playbackduration, depending on the data compression used for the video andaudio, and typical fragments may contain between 2 and 10 seconds ofplayback audiovisual data. For example, when the video content serviceadds a video program to its offerings, the service may process the videoprogram to encode the various fragments that comprise the video program,and may assign them sequential numbers to indicate their order in thepresentation of the program (e.g., fragment number 148). The service maystore information identifying the location of these fragments, as wellas their data size (e.g., 14 Mb).

In some embodiments, the service may generate different versions of thevideo program to accommodate different types of playback conditions. Forexample, the service may generate higher and/or lower resolutionversions of the same fragments, such as a 1080p or 720p pixel resolutionversion in addition to a standard definition version and a reduced-sizeversion for smart phones, and a version with 7.1 stereo audio inaddition to a version with basic two-channel stereo audio. Thesedifferent versions may be used to accommodate different playback devices(e.g., smart phones, tablets, personal computers, standard-definitiontelevisions and high-definition televisions), and to also accommodatedifferent amounts of available bandwidth.

The video delivery service may share the downstream bandwidth 301 a-cwith a variety of other services, and the overall usage may vary overtime, as illustrated in the graphs 303 a-c. This variation may changethe amount of available unused bandwidth, and embodiments describedherein may account for this variance in available bandwidth, and adjustits delivery of content to optimize the usage of the availablebandwidth. As will be described further below, in some embodiments, thecontent server 106 may intentionally delay and/or reorder the deliveryof content fragments to best use the available bandwidth. Further, sincethe available bandwidth may also fluctuate, embodiments herein mayreceive bandwidth usage reports from the termination server 104, and usethe reports to identify how much bandwidth is available.

FIG. 4 illustrates an example process for managing bandwidth usage. Theprocess may be performed by a computing device, e.g., the content server106, upon execution of corresponding instructions stored on acomputer-readable medium, such as hard drive 205 and/or RAM 203, and maybegin in step 401 with the initial configuration. The initialconfiguration may include establishing the downstream communicationpaths, or channels 301 a-c that will be used by the content serer 106.This may include identifying the initial user request for a streamingsession, identification of the source and destination addresses for thesession, and any other desired configuration detail to establish thedownstream communication.

The initial configuration may also include establishing an upstreamcommunication path, or channel 302, which the modem 110 may use totransmit content requests and status messages to the termination server104. The initial configuration may also include establishing a channelthrough which the termination server 104 can communicate with thecontent server 106.

In step 402, the content server 106 may create a request queue. Therequest queue may be a data structure that is used to identify thepieces of content that have been requested by the various devices in thesystem. For example, the queue may identify the various video fragmentsby their file name (e.g., “Movie #12342, fragment 343523”), and alsoidentify the requesting device (e.g., by its Media Access Control (MAC)address, or its Internet Protocol (IP) address, or by any other desiredidentification) and the time by which the requested fragment is needed(e.g., Monday, Dec. 10, 4:13:03 pm, or epoch time 1355174028).

In step 403, the content server 106 may determine whether an incomingrequest for a content fragment has been received from a requestingclient device, such as a user's tablet computer or the user's gateway ormodem. The request itself may be formatted as an IP packet, and maycontain information identifying the requesting device, the requestedcontent, and the time the content is needed. If such a request has beenreceived, then in step 404, the content server 106 may begin to extractinformation from the request. In step 404, the content server 106 mayidentify the time by which the fragment is needed. As noted above, thetime may indicate a time of day, which may indicate the time when therequesting device will finish playback of the portions of the programthat it has already received. Alternatively, the requesting device mayfactor into account delay due to reception, decoding and processingdelays, and the time needed value may indicate the point at which therequesting device wishes to have the next fragment, so that it mayfinish decoding it in time for display to the user.

In step 405, the content server 106 may identify the requested fragment,based on the content identification contained in the request. Thecontent identification may identify the content fragment by identifying,for example, the program or content item to which the fragment belongs,and the playback point in time of the needed fragment. For example, thecontent identification may indicate that the requesting device needs thenext portion of the high-definition (HD) version of the movie “The DarkKnight Rises,” beginning at 20 minutes, 10 seconds into the movie.Instead of listing the playback time of the requested fragment, therequest may alternatively simply indicate the last fragment number(e.g., fragment 2352) in the requesting device's buffer, and the contentserver 106 may respond by looking for the next fragment after the oneidentified in the request.

As part of identifying the next fragment, the content server 106 mayactually identify multiple versions of the fragment, as noted above. So,for a given portion of the video program, the content server may have afirst fragment encoded at a standard video definition (e.g., 486 linesper frame), a second fragment encoded at a high-definition (e.g., 1080lines per frame), and a third fragment encoded at a low resolution(e.g., 300 lines per frame). In the step 405 identification, the contentserver may identify all of these variant fragments as possibilities forresponding to the request. If the request identified a specific version(e.g., high-definition), then the content server 106 may also identifythe one that was requested by the user.

In step 406, for each of the identified fragments, the content server106 may determine, based on the data transmission rate of the downstreamchannels 301 a-c and the data size of the fragment, a cutoff time bywhich the transmission of the fragment needs to begin in order to arriveon or before the “time needed” indicated in the request. For example, ifthe data rate is 300 Mb/sec, and the HD fragment is a 300 Mb file, thenthe content server 106 may determine in step 406 that the fragment needsto be sent one second before the time needed in the request. Additionaltime (e.g., another second) may also be added to account for processingdelay. Information identifying the time needed, fragment requested,alternative fragments and cutoff times may be stored by the contentserver 106 in the data queue discussed above.

In step 407, the content server 106 may receive a message from thetermination server 104, identifying the current bandwidth usage levelsfor the one or more downstream channels 301 a-c. For example, in anHFC-type network, the termination server 104 may indicate the number ofQAM channels that are available for the video service to use, and theamount of space on the channels that is available in a current time slot(or slots, or future time slots) being prepared by the terminationserver 104. Alternatively, the bandwidth usage level may indicate anamount of the available bandwidth on a communication path or channelthat is already consumed. Over time, the bandwidth usage may resemblethat depicted in FIG. 5a . As illustrated, the bandwidth usage for agiven channel (e.g., channel 301a) may vary over sequential time slots,remaining under a limit 501, which may be a limit of the channel 301 aand/or a limit imposed on the service. The illustration also includestwo requested fragments Q1,Q2 in the queue, awaiting transmission, withthe sizes representative of the bandwidth needed for their transmission.The content server 106 may continuously, or periodically, receive thesemessages from the termination server 104. The loop shown in FIG. 4 mayalso skip this step in situations where a bandwidth update has not beensent by the termination server 104.

In step 408, the content server 106 may determine what future bandwidthavailability currently exists (e.g., has not been scheduled for use).Referring to FIG. 5a , if the current bandwidth message is received fortime t1, then the available bandwidth 502 may be used by the service.

In step 409, the content server 106 may determine whether there are anyurgent fragments awaiting transmission in the queue. A fragment may bedeemed urgent if the current time has reached the cutoff time for arequested fragment. If there are any urgent fragments in the queue, thenin step 410, the content server 106 may consult the stored informationidentifying the available bandwidth (from step 407), and the storedinformation identifying the requested fragments and their variants (fromstep 405) and determine how best to fit all of the urgent fragments inthe currently available bandwidth. Assuming that the requested urgentfragments will fit in the currently available bandwidth, then in step411, those urgent fragments will be sent from the content server 106 tothe termination server 104 for delivery to the requesting device.

However, if the available bandwidth is insufficient to fit the urgentfragment(s), then in step 412, the content server 106 may identifyreduced-sized versions of the requested fragment(s), and send thereduced-sized or reduced-quality version(s) to the termination server104 for delivery to the requesting device. The selection of thereduced-sized version may involve selecting the largest version thatwill fit in the available bandwidth. If there is insufficient bandwidthfor even the smallest version of the requested fragment, then thecontent server can skip the requested fragment for now, and await thenext bandwidth opportunity to send it.

In step 413, the content server 106 may adjust its own storedinformation identifying the available bandwidth, to account for anyfragments sent in steps 411 or 412, so that the bandwidth information isup-to-date for further use, and in case step 409 is encountered againbefore an updated bandwidth message is received from the terminationserver 104.

In step 414, the content server 106 may then check to determine ifanything remaining in the queue will fit in the currently-availablebandwidth. If there is enough room, then in step 415, the content server106 may send one or more fragments from the queue to maximize the usageof the currently-available bandwidth. To maximize this usage, thecontent server 106 may seek to use as much of the available bandwidth aspossible. Referring to FIG. 5b , if Q2 were the only fragment awaitingtransmission, then during the time slot t1 there will be an amount ofunused bandwidth 503 in that time slot. If the same fragment were sentin time t2 instead, there would be virtually no unused bandwidth, sosending the Q2 fragment at time t2 would better maximize the use of thebandwidth.

Of course, at time t1, the content server 106 might not know that abetter slot will be coming up in time t2. In such embodiments, if Q2were the only fragment awaiting transmission, then the content server106 may simply send that fragment in time t1. However, if multiplefragments are awaiting transmission at time t1, then the content server106 may seek to send the largest fragment that will still fit in theavailable bandwidth. So for example, referring to FIG. 5c , the fragmentQ1 is shown as using up more of the available bandwidth at time t1,leaving unused space 504 that would be smaller than the space 503 thatwould remain if Q2 were sent instead. To fill this space, the contentserver 106 may enter into a recursive algorithm, filling the availablespace with the largest fragment that will fit, reducing the amount ofavailable space accordingly, and then repeating the process until nomore awaiting fragments will fit in whatever space remains.

However, if at time t1, the content server 106 has information for aplurality of future time slots (e.g., if the message in step 407provided information for a plurality of future time slots on thedownstream channels 301 a-c), then the content server 106 could schedulethe Q1 fragment for transmission in time t1, and the Q2 fragment fortransmission in time t2. The content server 106 can use the sameapproach discussed above—find the largest waiting fragment that will fitin an available slot, and repeat until no more waiting fragments canfit.

When the content server 106 has finished arranging the fragment(s) tofill the available bandwidth, then in step 416, the content server 106may transmit the fragment(s) to the termination server 104 for deliveryto the requesting devices. From there, the process may return to step403, and can repeat as long as desired.

The example process above shows a degree of urgency in step 409, andgives those fragments priority in filling available space. In someembodiments, multiple degrees of urgency may be defined. For example, afragment may be deemed “urgent” if the current time is at or beyond thetime needed value identified in the client request. Another degree ofurgency (e.g., “less than urgent”) may be defined if the current time iswithin 5 seconds (or any other desired time window) of the time needed,and those “less than urgent” fragments may be given the next opportunityafter step 413. In such embodiments, after step 413, another set ofsteps similar to steps 409-413 may be used for the “less than urgent”fragments. There may be many such degrees of urgency, each with adifferent time window preceding the time needed, and each classificationof fragment may await its turn for consuming the current time slot(s)being filled.

The example process above handles urgent fragments first, and thenarranges whatever less urgent additional fragments will fit in theremaining available bandwidth. In alternate embodiments, the urgentfragments may also be arranged to maximize the usage of the availablebandwidth. For example, if multiple time slots are available as shown inFIG. 5b , and if Q2 were urgent, then the content server 106 may electto place the Q2 fragment in the t2 slot, since that will result in lessunused bandwidth. This may be acceptable under the condition thatdelivery of the Q2 fragment at time t2 to the requesting client willstill be within the time needed indicated in the client's request. Thismay also be true, even if the request for Q2 was made before the requestfor Q1—the content server 106 may rearrange the fragments so that theyare not sent in the same order in which their respective requests werereceived. Such a usage is illustrated in FIG. 5 d.

In some embodiments, the fragment requests 403 can be sent in responseto a user who has changed a playback speed of a streaming video. Forexample, a user may be watching a streaming movie, and decide to pressthe fast-forward button on his/her remote control. In response to thatpress, the user's client device (e.g., a DVR or tablet) may transmit anew fragment request 403, identifying a new fragment that is needed, andindicating that previous unfilled requests are no longer needed. Thecontent server may update its schedule to remove the unfilled requests,and add the new fragment request. In embodiments where the user mayindicate a new playback point (e.g., by requesting to jump ahead in theprogram by 30 seconds), the user's client device may transmit a newfragment request for the new playback point, and prior unfilled requestsfor the user may be discarded by the content server. If the new playbackpoint is one for which the client has already sent a request (e.g., ifthe client was trying to keep a 45-second buffer of content ahead of thecurrent playback point, then the fragment that is 30 seconds ahead mayhave already been the subject of an earlier request), then the contentserver may respond by escalating the priority of that requestedfragment, and its subsequent fragments, to reflect the jumping ahead. Inthis manner, an upstream signaling from the client to the server mayindicate the client's current playback status, and that upstreamsignaling may be used by the content server to manage its downstreambandwidth allocation.

Although example embodiments are described above, the various featuresand steps may be combined, divided, omitted, and/or augmented in anydesired manner, depending on the specific outcome and/or application.Various alterations, modifications, and improvements will readily occurto those skilled in art. Such alterations, modifications, andimprovements as are made obvious by this disclosure are intended to bepart of this description though not expressly stated herein, and areintended to be within the spirit and scope of the disclosure.Accordingly, the foregoing description is by way of example only, andnot limiting. This patent is limited only as defined in the followingclaims and equivalents thereto.

We claim:
 1. A method comprising: receiving, by a computing device, arequest for a content fragment; identifying, by the computing device, anamount of available bandwidth in a time slot; selecting, by thecomputing device and from a plurality of versions of the contentfragment, a largest version of the content fragment that will fit in theamount of available bandwidth in the time slot; and transmitting, by thecomputing device, the largest version of the content fragment in thetime slot.